Thermomechanical Behavior Modeling of a Cr-Ni-Mo-Mn-N Austenitic Stainless Steel — Oak Academic Publishing
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Thermomechanical Behavior Modeling of a Cr-Ni-Mo-Mn-N Austenitic Stainless Steel
Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
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Engineering Coordination, Universidade UNICEUMA, São Luís, MA, Brazil
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Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
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Department of Materials Engineering, McGill University, Montreal, Canada
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Department of Materials Engineering, McGill University, Montreal, Canada
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Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
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Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
1 Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
2 Engineering Coordination, Universidade UNICEUMA, São Luís, MA, Brazil
3 Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
4 Department of Materials Engineering, McGill University, Montreal, Canada
5 Department of Materials Engineering, McGill University, Montreal, Canada
6 Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
7 Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão—IFMA, São Luís, MA, Brazil
The analytical approach and the thermomechanical behavior of a Cr-Ni-Mo-Mn-N austenitic stainless steel were characterized based on the parameters of work hardening ( h ), dynamic recovery (r ) and dynamic recrystallization ( n , t 0.5 ), considering constitutive equations ( σ , ε ) and deformation conditions expressed according to the Zener-Hollomon parameter ( Z ). The results indicated that the curves were affected by the deformation conditions and that the stress levels increased with Z under high work hardening rates. The σ c / σ p ratio was relatively high in the first part of the curves, indicating that softening was promoted by intense dynamic recovery (DRV). This was corroborated by the high values of r and average stacking fault energy, γ s fe = 66.86 mJ/m 2 , which facilitated the thermally activated mechanisms, increasing the effectiveness of DRV and delaying the onset of dynamic recrystallization (DRX). The second part of the curves indicates that there was a delay in the kinetics of dynamic softening, with a higher value of t 0.5 and lower values of the Avrami exponent (n) due to the competing DRV-DRX mechanisms, and steady state stress ( σ ss ) was achieved under higher rates of deformation.
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